How NOT to Summon a Demon Lord: Volume 10 (How NOT to Summon a Demon Lord (light novel) (10))

Summary

Endeavor in my name. I'll allow it! Let's go on an adventure then-to the Viridian Cathedral!
MMORPG Cross Reverie's top player, Takuma Sakamoto, is summoned to another world where he's forced to play the part of his in-game character, Demon Lord Diablo! Diablo has successfully saved Faltra in his greatest battle yet, but there's no rest for the weary!
A summons arrives from the Kingdom of Lyferia, demanding Diablo make an audience with the king. However, Diablo also learns the wedding ring he gave Rem actually forms a pair with Shera's! Diablo teams up with Faltra's guildmaster, Sylvie, to arrange an official substitute.